vo_opengl_old: fix OSD regression

Commit 0e8fbdbd removed the rg_texture requirement from vo_opengl;
commit 541f6731 changed to a more convenient method. Both commits broke
vo_opengl_old in some ways. vo_opengl_old always requires GL_ALPHA for
single-channel texture, because it draws the OSD without shaders and by
using certain blend modes.

So we need to explicitly distinguish between vo_opengl and vo_opengl_old
in the OSD renderer, and force fixed texture formats for vo_opengl_old.
The other logic is specific to the internals of vo_opengl. (Although it
might be possible to get the same result by playing with the old GL
fixed-function functions in vo_opengl_old. But seems like a waste of
time.)

Fixes #1370.

Conflicts:
	video/out/gl_osd.c

1 files changed, 1 insertions, 1 deletions

diff --git a/video/out/vo_opengl_old.c b/video/out/vo_opengl_old.c
index 91a14398d5..78284718aa 100644
--- a/video/out/vo_opengl_old.c
+++ b/video/out/vo_opengl_old.c
@@ -1687,7 +1687,7 @@ static int initGl(struct vo *vo, uint32_t d_width, uint32_t d_height)
     }
 
     if (gl->BindTexture) {
-        p->osd = mpgl_osd_init(gl, vo->log, vo->osd);
+        p->osd = mpgl_osd_init(gl, vo->log, vo->osd, true);
         p->osd->scaled = p->scaled_osd;
     }